Glassworking press



Oct. 1s, 193s.

L. F. GooDRlcll GLAS SWORKING PRESS Filed arch l6, 1936 INVENTOR. Ew G'oaR/c/r 3 Sheets-Sheet 1 oct. 1s, 193s. GOQDRICHr 2,133,167

GLAsswoRKING PRESS Filed March 16, 1936 3 Sheets-Sheet 2 2O re36 I '8 23 O- vI6A d Il INVENTOR.

ATTORNEYS.

Oct- 18, 1938- L. F. GooDRlH GLASSWORKING PRESS Filed arch 16, 1936 3 She'rtS/-Sheet 3 .H TP. E N0 N EOUR Vo .m m6 C. H Z ,Y B

Patented Oct. 18., 1,938

UNITED STATES PATENT oFF-ICE GLAS SWORKING PRESS Levi F. Goodrich, Corning, N. Y., assignor to Corning Glass Works, Corning, N. Y., a corporation of New York Application March 16, 1936, Serial No. 69,201 7 claims. (c1. 49435) This invention relates to improvements in glass ly completed, thereby permitting better pressure working apparatus and particularly to glass presscontrol during the final and most critical stage of ing mechanisms. the pressing operation.

The molds and plungers generally used in glass Other features include a mold, a plunger, means working apparatus for pressing glass charges in-y for advancing the plunger into the mold, aring to predetermined forms usually have a ring which seated on the mold and surrounding the plunger, seats upon the periphery ofthe upper edge of the and means actuated upon the advancing stroke mold surrounding the mold cavity. As the molten ofthe plunger to hold the ring in contact with the glass is pressed into shape by the downward travmold independently of the plunger.

el of the plunger into the mold, it is forced The above objects may be attained by the use 1o upwardly around the plunger toward the upper of my invention which includes the novel conedge of the mold and against the mold ring. The struction, combination, and arrangement of parts ring limits and determines the extent of rise of as fully set forth in the following specification, the glass in the mold and to prevent the glass from claimed and illustrated in the accompanying l5 checking during the pressing operation, the ring drawings, in which: lo I is yieldably held in engagement with the mold Fig. 1 is a front view in elevation of a glass by a plurality of compression springs ordinarily working press embodying my invention, certain carried by the plunger operating mechanism. portions of which are shown in section;

The power needed to compress the springs is Fig. 2 is a view similar to Fig. 1 showing the necessarily high in order to resist the rise of the plunger advanced into the mold; 20

glass beyond the confines of the mold. With the Fig. 3 is a side view of Fig. 2; y spring compressing mechanism carried by the Fig. 4 is a transverse sectional view taken on plunger operating mechanism, this power has the line 4 -4 of Fig. 1; e heretofore been supplied directly by the pressman Fig. 5 is a transverse sectional view taken on, while he was advancing the plunger into the the line 5-5 of Fig. 1; and 25 mold cavity and pressing the glass. This arrange- Fig. 6 is a perspective view of yoke 33 of the ment required the pressman tocontinue applying assembly. the pressing force to hold down the mold ring Referring to the drawings indetail, a bed I0 is after movement of the plunger had been comsupported on legs II and provided withstandards pleted and after the pressing force was no longer I2. Slidably mounted on the standards I2 near 30 required. Due to this fact the force applied to the their upper ends is a power head I3 carrying atI plunger during the final stage of the pressing opopposite ends trunnions I4 to which the upper eration was diiiicult to judge accurately, owing to ends of connecting rods I5 are secured. The

the high pressure required to maintain' the springs lower ends of the connecting rods are pivoted to of the mold ring hold-down mechanism comvcrank arms I6 carried on Iopposite ends of a 35 pressed. The result of this was that the quality of shaft I'I which is journalled in the legs I I and exthe product depended to a large degree upon the tends transversely of the machineas illustrated skill of the pressman and his response to the feel in Fig. l. Connected to one of the crank arms of the press lever. IE is a hand lever I8 by means of which the shaft 40 It is an object of this invention to reduce to a I'I is rotated to exert downward pull on the power 4o minimum the power necessary for proper funchead I3. A counter-weight I9 is connected to tioning of glass pressing devices during the critthe crank arms in such a position as to yieldingly ical period of the pressing operation. g urge the power head into elevated position when Another object is the vproduction of pressed the press is at rest'. Y y

glassware of uniformly high quality without hav- Slidably mounted on the standards I2 in spaced 45 ing to depend to any great extent upon the Skill of relation' to the power head I3 and movable in' the pressman. unison with the latter is a press head 20 carry- Among its features, my invention embodies ing a mold plunger 2| which aligns with the mechanism operated in a. predetermined sequence cavity 22 of a mold 23 supported upon the bed I0.

duringaglass pressing operation to automatically Connecting l the power head I3 with the press 50 regulate the effectiveness of the pressing operahead 20 is a rod 24 adjacent the upper ends of tion, in such a manner that the springs of the which are screw threads 25 for cooperation with mold ring compressing mechanism are held com- 1 .adjusting nuts 26 and 21 by means of which the pressed without effort bythe pressmanl as soon as distance between the power head and press head the downward stroke of the plunger is substantialmay be accurately adjusted.

. threaded as at 38, while the lower ends\are' Secured to the standards I2, atv a point intermediate the power, and press heads, is a trans,- versely extending frame 28 which is provided with depending ears 29 to which the upper ends of links 3D are pivoted. The lower ends of these :links are pivoted to the upper ends of links 3|, the lower ends of which in turn are pivoted to upstanding ears 32 carried by a yoke 33. This yoke is slidable upon the connecting rod 24 and is providedat spaced intervals with openings 34 (Fig. 6) through which spring supporting rods- 35 are slidable. The upper ends of these rods are secured to a pressure ring 36 and downward motion of these rods through the openings 34 is limited by nuts 31 which cooperate with the screw threads 38 above mentioned. Compression coiled springs 39 surround the rods and'engage the under side of,the yoke 33 and the upper side of the pressure ring 36 so as to yieldingly urge the ring 36 downwardly.

Formed intermediatethe upper and lowerends of the connecting rod 24 are screw threads 40 for cooperation with adjusting nuts 4| and 42 by means of which a sleeve 43 carrying diametrically opposed radial ears 44 is adjustably connected to the connecting rod 24. Pivoted to the ears 44 of the sleeve 43 are the upper ends of drive links 45 the lower ends of which are pivoted to the junction of the links 30 and 3|.

In operation, a charge of glass 46 is deposited in the mold cavity 22 after which a mold ring '41 is positioned on the upper side of the mold 23 surrounding the cavity. The lever I8 is then moved l to exert downward pull upon the power head I3, thus causing the plunger 2| to enter the mold cavity to press the glass intothe desired form.

' Simultaneously with the downward motion of the mold plunger 2 I, the sleeve 43 moves down into the position shown in Fig. 2, thus causing the links 30 and 3| to exert downward pressure upon the yoke 33 until they reach the position shown in Fig. 2. The pressure ring 36 is thus seated on the mold ring 41 with the springs 39 compressed, 1

so as to yieldingly hold the mold ring against the upper face of the mold. T he straightening of the links 30 and 3|, as illustrated in Fig. 2,

takes place slightly before the mold plunger has reached its downward limitof travel so that at themoment the glass contacts the mold ring any upward pressure exerted by the glass against the mold ring is-transmitted to the pressure ring 36 through the springs 39 and yoke 33 to the links 3|) and 3| and thence directly against the rigidly supported frame 28. With the linkage as prei vided it will be seen that, after the plunger 2| has reached its downward limit of travel, the only pressure necessary to-hold all parts in their relative positions is that -required to overcome the opposing force of counterweight I9. By the use of such a press mechanism even an inexperienced pressman can readily feel the release of tension -on the press lever as tensionY of the compressed springs 33 is transferred from rod 24 -andcrossmember 28, entirely to the cross-member, and is thus able to easily control the pressing force on the plunger at the final and most critical stage of the pressing operation.

While in the foregoing there has been shown and described the preferred embodiment of` my invention, 'it is to be understood that minor changes in the details of construction, combinav tion, and arrangement of parts may be resorted first means.

2. In a glass Workingpress, a mold, a mold ring, yieldable means forV holding said mold ring agaixt such mold, a plunger, a common means for advancing said plunger into said mold and for rendering effective said yieldable means, and means excluding said common means for holding said yieldable means effective after the movement of said plunger has been completed.

3. In a glass Working press, a mold, a plunger, a mold ring seated on said mold, yieldable holddown means for said mold ring arranged above said ring, a rod for forcing said plunger into said mold and said yieldable means into compressed engagement with said mold ring, and other means for-.holding said yieldable means effective after the movement of said plunger has been completed.

4. The method of pressing glass which includes 'applying pressure to molten glass to cause certain portions thereof to rise, yieldinglyrestricting the rise of such portions beyond predetermined limits, and separately continuing pressure application to such portions and to the remaining portions of the article during the completion l of the pressing cycle.

5. In a glass working press, a mold and a cooperative plunger, means to advance said plunger into said mold, a mold ring, apressure ring; and mechanism, actuated by said means, which resiliently seats said pressure ring on the' mold ring and which also relieves the pressure from said means required to maintain the pressure ring so seated, after said means has advanced said plunger a predetermined distance.

6. In a glass working press, a mold and a cooperative plunger, means to advance said plunger into said mold, a mold ring, a resiliently mounted pressure ring, and means' including a system of levers actuated by saidilrst means to seat said pressure ring under tension of its resilient mounting to resiliently hold said mold ring in position on said mold, said latter means being so arranged `with respect to'said iirst means that the force said springs, and nally to remove their counterpressurefrom' saidrod during-the nalstage of movement of the plunger into the mold.

. LEVI F. GOODRICH. 

